<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="" />
      </div>
      <!-- 登陆表单区域 -->
      <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">
          <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" 
          prefix-icon="iconfont icon-3702mima"
          type="password"></el-input>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
    data(){
        return{
            //登陆表单数据绑定对象
            loginForm:{
                username:'admin',
                password:'123456',
            },
            //表单验证规则对象
            loginFormRules:{
                username:[
                    { required: true, message: '请输入登录名称', trigger: 'blur' },
                    { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
                ],
                password:[
                    { required: true, message: '请输入登陆密码', trigger: 'blur' },
                    { min: 5, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
                ],
            }
        }
    },
    methods:{
        //重置按钮
        resetLoginForm(){
            this.$refs.loginFormRef.resetFields();
        },
        login(){
            this.$refs.loginFormRef.validate(async (valid)=>{
                if(!valid) return;
                const {data:res}=await this.$http.post('login',this.loginForm)
                if(res.meta.status!==200)   return this.$message.error('登录失败！')
                this.$message.success('登录成功')
                /* 将登录成功之后data中的token保存到客户端的sessionStorage中
                保证其他API接口在登录成功后才能访问，也保证token只应该在网站打开期间有效 */
                window.sessionStorage.setItem('token',res.data.token)
                /* 跳转到Home组件 */
                this.$router.push('/home')
            });
        }
    }
};
</script>

<style lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
}

.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

.avatar_box {
  height: 130px;
  width: 130px;
  border: 1px solid #eee;
  border-radius: 50%;
  padding: 10px;
  box-shadow: 0 0 10px #ddd;
  position: absolute;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: #fff;
  img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: #eee;
  }
}

.login_form{
    position:absolute;
    bottom:0;
    width:100%;
    padding:0 20px;
    box-sizing: border-box;
}
  .btns{
      display:flex;
      justify-content: flex-end;
  }
</style>